This work focuses on the development of a method to make nano cobalt ferrite
powder using a solgel process. A particular emphasis is devoted to the
understanding of the role of the chemical parameters involved in the solgel
technique, and of the heat treatment on the structures and morphologies of the
materials obtained. Several samples of cobalt ferrite powder were obtained by
varying the initial parameters of the process in addition to the heat treatment
temperature. Xray diffraction and scanning electron microscopy were used to
identify the structure and morphology of samples demonstrating the influence of
the initial parameters. DTA/TGA was carried out on one sample to identify
important reaction temperatures during the heat treatment. The average particle
size, as estimated for one sample by the full width at half maximum (FWHM) of
the strongest Xray diffraction (XRD) peak, was found to be about 45 nm. It has
been found that the chelating agent and the crosslinker have a critical
influence on the resultant structure, the particle size and the particle size
distribution.

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